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Microstructure and mechanical behavior of spray-deposited Al-Cu-Mg(-Ag-Mn) alloys

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Abstract

The effect of alloy composition on the microstructure and mechanical behavior of four spray-deposited Al-Cu-Mg(-Ag-Mn) alloys was investigated. Precipitation kinetics for the alloys was determined using differential scanning calorimetry (DSC) and artificial aging studies coupled with transmission electron microscopy (TEM) analysis. DSC/TEM analysis revealed that the spray-deposited alloys displayed similar precipitation behavior to that found in previously published studies on ingot alloys, with the Ag containing alloys exhibiting the presence of two peaks corresponding to precipitation of both Ω-Al2Cu and θ′-Al2Cu and the Ag-free alloy exhibiting only one peak for precipitation of θ′. The TEM analysis of each of the Ag-containing alloys revealed increasing amounts of Al20Mn3Cu2 with increasing Mn. In the peak and over-aged conditions, Ag-containing alloys revealed the presence of Ω, with some precipitation of θ′ for alloys 248 and 251. Tensile tests on each of the alloys in the peak-aged and overaged (1000 hours at 160 °C) conditions were performed at both room and elevated temperatures. These tests revealed that the peak-aged alloys exhibited relatively high stability up to 160 °C, with greater reductions in strength being observed at 200 °C (especially for the high Mn, low Cu/Mg ratio (6.7) alloy 251). The greatest stability of tensile strength following extended exposure at 160 °C was exhibited by the high Cu/Mg ratio (14) alloy 248, which revealed reductions in yield strength of about 2.5 pct, with respect to the peak-aged condition, for the alloys tested at both room temperature and 160 °C.

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Authors and Affiliations

  1. the Department of Chemical and Biolchemical Engineering and Materials Science, University of California at Irvine, 92697-2575, Irvine, CA

    L. Del Castillo (Graduate Research Assistant) & E. J. Lavernia (Professor and Chair)

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  1. L. Del Castillo
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  2. E. J. Lavernia
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Del Castillo, L., Lavernia, E.J. Microstructure and mechanical behavior of spray-deposited Al-Cu-Mg(-Ag-Mn) alloys. Metall Mater Trans A 31, 2287–2298 (2000). https://doi.org/10.1007/s11661-000-0145-8

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